[Thunar-dev] Folder thumbnailers

[Yuzem]

Hello, I have some questions:
Does thunar support folder thumbnailers?
Nautilus does support this and there is already a thumbnailer for folders:
cover-thumbnailer <http://software.flogisoft.com/cover-thumbnailer/en/>

I want to make a folder thumbnailer for thunar to produce thumbnails like in
the screenshots:
http://img230.imageshack.us/img230/5808/pantallazohu0.jpg
http://img209.imageshack.us/img209/1/pantallazo10ax2.jpg
http://img163.imageshack.us/img163/8576/comicavatarsbk3.jpg

I tried to use inode at directory (used by cover-thumbnailer for nautilus) but
it doesn't work:

[Desktop Entry]
Version=1.0
Encoding=UTF-8
Type=X-Thumbnailer
Name=folder
MimeType=inode at directory
X-Thumbnailer-Exec=/bin/sleep 1 -s %s %u %o

How can I set a folder thumbnailer in thunar?
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